Help, just put intake/exhaust, glow plugs and Edge programmer on a 95 7.3, 4x4 CC w/312k miles I drove it back to the guys house Sunday, all good, he drove it monday and tuesday, now has an oil leak on drivers side, NOT from valve cover, what is a common leak???? on this side of the engine

 

you check thr oil cooler?

 

I am gonna go wipe it down and check it friday,,,,,aarrggghh

 

Is it coming from the front or the rear part of the engine? If it is the rear, i had a truck i worked on, where the actual rear header casting for the oil cooler had a pinhole in it that was invisible to the naked eye. Pressure test showed the leak. I had to buy a new header for the guy. It looked as if the oil was leaking out of the gasket that seals the header to the block.

 

Turned out to be the oil cooler, he had driven it, the day before, then I went down first thing in the morning, steady stream right out of the front.